GVariant visitor test
GVariant visitor test

[Bug/Feature]   GVariant visitor test
[Cause]         N/A
[Solution]      Test convert to and from GVariant
[Verification]  Build, run tests: vasum-server-unit-tests -t ConfigurationSuite

Change-Id: I8e7573bc3d44724b17560bfaa9a040922530ff40

Samsung/vasum,Samsung/vasum,Samsung/vasum,Samsung/vasum